This review did not examine evidence for how long it takes a normal-weight person to become overweight or obese; this remains an unanswered question that may be the focus of future clinical research. The Honolulu Heart Program. Although open to all intervention participants, these sessions were primarily intended for those who experienced weight gain or who were unhappy about the amount of weight they gained during the first half of the program. Despite increasing prevalence of overweight and obesity, and the enormity of the social, emotional, physical and economic sequelae, there are few upstream measures in place for true primary prevention directed at the normal-weight population. Effect of weight loss on upper airway collapsibility in obstructive sleep apnea.